Timothy j



(No Model.)

* T. J. KIELEY.

BACK PRESSURE VALVE.

N0. 365,477. I I Patented June 28, 1887.

N. PETERS. Photo'ulhognphor, WalhlngtnILD. Q

' UNITED; STATES PATENT OFFICE.

TIMOTHY J. KIELEY, on NEW YORK, M.

BACK=PRESSURIE VALVE.

SPECIFICATION forming part of Letters Patent No. 365,477, dated June28,1887.

Application filed September 11, 1886. Serial No. 213,346. (No model.)

To all whom it may concern.-

Be it known that I, TIMOTHY .T. KIELEY,

' ofthe city, county, and State of New York,

have invented a new and useful Improvement in Back-Pressure Valves, ofwhich the following is a full, true, and eXact description, ref-- erencebeing had It is frequently customary to cause the ex-' haust of anengine to enter the heating system of a building for the purpose ofutilizing its waste heat in such heating. It is obvious, however, thatthe pressure in the heating system cannot, under these circumstances, be

permitted to increase over a given amount withoutseriousl yinterferingwiththe operation ofthe engine. The valve which I have constructed isintended to maintain exactly uniform pressure in the heating system, andin the form which I prefer all stuffing-boxes are dispensed with, whileat the same time a diaphragm is so employed as to aid in the rapid andcertain closing ofthe valve.

In my drawings similar letters refer to similar parts.

Figure 1 represents my invention as adapted to airangle valve-box; Fig.2, the same structure applied toastraight-way valve-box, showinglikewise a method of applying an adj usting-screw to hold the valve.

I will first describe Figs. 1 and 2. A represents the valve-box; B, thevalve,

closing upward. This valve is held against,

its seat by the lever D and adjustable weight E. The valve-stem O isconnected witha diaphragm, F, which allows sufficient movement of thevalve without necessitating the use of a stuffing-box. v a

H represents the inlet from the steam-heating system; K,- the outlet tothe atmosphere.

In Fig. 2, L represents a screw which may be forced down upon the valveto remove the valve from itsseat and hold it permanently open when thisend is desired. v V

Theoperation of my valve can now' be understood; lVhen the pressure ofthe inlet be comes sufficient to overcome the weight .the' valve isforced open, allowing escape to the atmosphere.

The diaphragm F performs two functions. In the first place, itenablesthe valve to be constructed without a stuffing-box upon its stem, whichstuffing-box is a disadvantage, and, in the second place, insures thesudden closing of the valve, as, when the steam has begun to be shut offby the upward movement of the valve, a partial vacuum will beformed inthe outlet K, and the air-pressure beneath the diaphragm will tend toforce the valve 13 firmly to its seat.

It will observed that the diaphragm F is situated upon the exhaust oratmospheric side of the Valve, so that the steam has practically noeffect thereon, the diaphragm in this instance not operating, asheretofore, to present an extended surface in order that the lowpressure in a heating system may counterbalance a high pressure from theboiler, but to enable the dispensing with a stuffing-box on the val'vestem and to insure a sudden cutting ofi ofthe steam when the pressureis reduced, as has been hereinbefore described.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, in a back pressu re valve, of the valve opening awayfrom the inlet, the valve-stem, a diaphragm, 1 situated on theatmospheric side of the valve, whereby it is practically unaffected bysteam-pressure, and a counterbalancirig-weight to close the valveagainst its seat, substantially as described.

2. The combination, in a back pressure valve, of a valve opening awayfrom the inlet, a valve stem, a diaphragm-connected to the valve-stemand situated on the atmospheric side of the valve, whereby it ispractically unaffected by steam-pressure, acounterbalancingweight, andan adjusting-screw, L, for hearing against the valve to maintain it inpermanent open position, substantially as described.

TIMOTHY J. KlELEY.

